Edward h



Nov. 1, 1927. 1,647,532

E. H. LORENZ GLASS BLOWING MACHINE Filed Sept. 1, 1922 Patented Nov. 1,1927.

UNITED STATES PATENT OFFICE.

EDVEARD H. LORENZ, OF WEST HARTFORD, CONNECTICUT, ASSIGNOR TO HARTFORD-EMPIRE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF DELAWARE.

GLASS-BLOVJING MACHINE.

Application filed September 1, 1922. Serial No. 585,638.

This invention relates to glass blowing machines, its object being toprovide an improved blowhead, which among other things is adapted toutilize compressed air from a single source of supply to producedifferent pressures for the blowing and holding down operations of theblowhead. This ditferen tial pressure is automatically maintainedthroughout any changes in the pressure oi the air supply, whereby theblowing pressure is prevented from overcoming the hold ing down pressureand consequently the blowhead remains firmly seated upon the moldthroughout its blowing; operations.

The compressed air for the blowing and holding down operations of theblowhead is periodically admitted from a supply source to a chamber fromwhich the separate supplies are taken for said blowing and holding downoperations, by means synchronized to admit the air to said chamber inproper time relation to the time the blowhead is brought into positionto cooperate with the mold.

The invention also includes a freely adj ustable blowhead portion, whichwhen moved into engagement with the molds automatically becomes adjustedto properly seat itself thereon regardless of any slight angular orlateral variations in the position of the molds or the hlowhead fromtime to time. The invention further includes improved means for manuallyadjusting the blowhead to accurately center it with the molds byshifting it transversely thereof and also improved means forautomatically moving the blowhead up and down into cooperative relationwith successive molds.

Further objects will appear from the following description, alien inconnection with the accompanying drawing illustrating one embodiment ofthe invention.

Figure 1 is a sectional elevation of a blow head, taken on line 11 of:Figs. 2 and 3;

Fig. 2 is a plan view, in section, on line 2-E2 of Fig. 1;

3 is a bottom View, in section, taken on line 3-3 of Fig. 1;

Fig. l is an enlarged detail section showing the application of theblowhead to the finishing mold; and

Fig. 0 is a fragmentary sectional elevation of a portion of themechanism for raising and lowering the blowhead, and for controlling thesupply of air thereto.

Blowheads embodying the present invention may be used with or adapted todifferent types of glass making machines. includ ing those in which thehlowheads and the molds are carried on a revolving turret, and theblowheads are swung into and out of engagementwith the molds for thedifferent blowing operations at the several stations provided.

The blowhead 10 is carried on the outer end oi'i' an arm 11 and isadapted to cooperate, first with the parison mold or neck ring 12 forcounterblowing the blank or parison, (Fig. 1) and thereafter with theblow mold 13 for imparting the finishing blow to the bottle. 1-).

The blowhead includes a cylinder 14: in which is mounted a piston 15having a hellow stem 16, slidably mounted in the bearing 17 on thecylinder head. Secured upon the upper end of the piston stem is a washer18, which is held in position by a pin. 19 removably inserted throughthe stem 16. A spring 20 is interposed between the washer and head ofthe cylinder to maintain the piston in its uppermost position when notin operation, the piston being limited in its downward movement by astop 21 extending upwardly from the bearing 17. Disposed upon the top ofthe cylinder is a cap or cover 253, secured by screws 23, the cover, inconjunction with the top of the cylinder, forming an air chamber orpassage 24- in "free communication with the hollow piston stem 16.

The arm 11 is in the form of a casing or receptacle, thus affording anair chamber 25 from which compressed air is supplied, both. for holdingthe hlowhead down upon the mold and for blowing the blank therein.

The supply of air to the piston chamber 26 for holding the blowhead downupon the mold is regulated by an adjustable valve 2? serving to vary thesize of the passage 28, whereby the flow of air to the piston chambermay be regulated, as may be required. The air pressure applied throughthe piston stem 16 for blowing the bottle is always less than that forholding the blowheud down upon the mold, although both supplies aretaken from the common supply chamber 525. This dillcrence is caused byinterposing a valve 29 between the chambers 2i and 25, the valve beingheld down by a spring 30 disposed within 21- depending boss 31 on thecover 22. The spring is of such a capacity as to permit the valve toopen only after or about the time the blowhead is seated upon the mold,at which time the pressure builds up in the chamber 25 sutiiciently toovercome the resistance of the spring 30, the strength of which isaccording to the difterential air pressure desired.

By this means separate supplies of air of difterent pressures areobtained for the blow operation and for the holding down operation ofthe blowheud, the diilerentiel remaining constant at all times,according to the pressure of the spring 30. It these two air, pressureswere equal or nearly equil, the blowing pressure might overcome theholding down pressure end cause the blowheud to become unseated upon themold during the blowing operation.

The piston 15 constitutes a support for a depending freely adjustabledwice for cooperation with the molds, which will automatically assumecorrect position upon the D'lOlClS regardless of any slight angular orlateral variations eithe in the position of the in lds or of theblowheud. This device, wl ich is quickly detuchuble, is made up of uplurality of relatively moveole parts tree to assume different positionsof adjustmentrelutive to the piston and also relative to each other.This device con prises the air cuo 32 and mold cup or ring; 33, theforniier serving as e. errier :tor the letter. A plurality oi lugs 34Lextend downwardly from the piston 15 and inwardly terzil projections 35on the annular portion 36 of the cup 3.4. The cup may be readily removedfrom and replaced in the piston by turning it for enouo'hto more theprojections out of or .Io coincidence with the lugs 3d. The flou 36 ofthe cup is provided with a. plureliqy of notches 3T, profit e1" ublylocated adjacent the projections 35, one of which is adopted to receive:1 spring" 38 secured upon and extending downwardly from the piston 15,whereby the cup is pr vented from accidentally turnip and thus becomingdisplaced from the piston.

The mold cup or ring; is detuchebly enrby the lugs 39 on the cup 32 inthe some manner as that just'discribed in connection with the mountingof the cup upon the piston. The ring 33 isprevented from accidentaldisplacement from the cup 32 by s )IlDQ 40 secured uoon the cu 3 andiro'ecte i l .l ug downwardly into one of a. plurality or arness notchesformed in the ring. touilicient play is provided between the ring; 2:33and lugs 23$) to permit of e. slight lute rul movement ot the ring uponthe cup, in order that it uniy it'rcely accommodate itself to the moldsto iiu-ure proper contuct therewith. Likewise u certain amount of phtyis provided between the lugs 3st and projections 35 on the flange 3d ofthe cup in order that the cup may be true to shift lute ally upon thepiston.

The depending mold cooperating ports 7. 'urried by the piston,including; the cup 552 and ring ure mounted for ungulur movement uponthe piston to take :ure of any :ingulur variations in the position ofthe molds with respect to the blowheud. 'lhe l'luuge 3b of the cup 32 isprovided with. u spherical seat ll, which is adapted to SG lt upon theannular inclined surface of the piston, whereby z line-contact is madebetween the cup and piston to produce an air tight joint to preventescape oi the blowiiu uir, which comes downwurdly through the stem is oithe p ston. The router oi curvuture o I the spherical surface :tl isdisposed sub-stout iully in the plane of the top or soiling; suril urcof the blzinl; mold when the bh v heed. occu pies an operutive positionrchtire to this 1311011 I V 3 illustrated in Fig. 1, iii d very close tothe top or sealing surituc of the blow mold when the blow headoccupies-z an opcutive position relative to this mold, us; il-

ed in Fig". t, whereby tilting mom. i the blow heed does not d1 rice itto any greet extent relative to r-itlui' iiol' In other words, the moldj sur: *es oi the blow head ure di posed entir ly within :1. so

. H here dclined by a continuation of the curved surl'ure oi? the socketwithin wh ch the s lino; memhrw is inoin d. l i

purisou llany mold huppens t be .i respcd to the lJlOWlH-(ltl, the lurlytilt upon the piston with the mold; so that the one: of the co, and moldwill be uirullel. it any mold i. slightly ispluced utcrullv oi theblowhezsd. the clumping 3?; t luterully to e similrir emcnt upon the cupto ucromu'u'idute ituelii to the mold :uul form 1111 :iii' tiga ht iointtherewith.

i soiling plate 1 3 i uduoted to l' llv en YO the .op ot the il ll utthe time the lllOl'l cup is more into eugtn enicnt with the inolthwhereby tie sir or blowing the bottle is prevented from oping around thetop. 'lhe reuliugy piste is provided with u hollow stein i5pi'e'l'erubly project 1p; into the stem ltl oi: the piston, withsuilicient 'loosenesu to allow its upper end to swing freely with thecup on its spherical seat t1. when tilted es above described. Thesealing plate is supported in the cup 32 by means of :1 tapered splitchimp or collet 47 surrouiuling the stem 45, so that when the nut 19,threaded upon the end of the collet, is screwed down upon the boss 48,the split jaws of the collet wi'll clamp the stem. By loosening thenutt9, the sealing plate may be readily adjusted to the desired height,according to the distance the top of the parison or bottle projectsabove the mold 18. The collet is prevented from turning by means of apin 50, extending through the boss 48 into the space between two of thejaws of the collets, (Fig. 1).

Since it is desirable to use the blowhead with molds of differentproportions to pro duce articles of ware varying in size, the

depending mold cooperating device carried by the piston may be readilyremoved as a unit and another similar unit of different proportionssubstituted therefor, as indicated by the larger unit shown in dottedline position in Figure 1.

The arm 11 of the blowhead is clamped upon av hollow shaft 51, the lowerend of which is slidably mounted in a bearing (not shown) on a suitablyrotated turret 52, (Fig. 5) Tclescoped into the hollow shaft 51 is atube 53, the upper end of which is secured to a valve casing 54, alsocarried by the turret 52, the shaft 51 being adapted to freely slideupon the tube. To move the blowhead into and out of position tocooperate with the mold, the arm 11 is adapted to be raised and loweredby a lever 55 pivoted on a braclret 56 adapted to be supported by theturret 59.. The outer end of the lever is forked and suitably connectedwith the grooved collar 57 on the upper end of the hollow shaft 51,while the inner end of the lever is provided with a roller 58, adaptedto travel in a cam path 59 on a stationary cylinder or casing 60, aboutwhich the turret 52 rotates.

The shaft 51 may be oscillated by any suitable means (not shown) toswing the arm 11 so as to move the blowhead into and out of verticalalignment with the mold, in case it is desired to swing the blowheadclear of certain parts of the machine, during the rotation of theturret.

Compressed air for holding the'blowhead down and for blowing the blankand bottle periodically supplied to the chamber 25 in the arm 11 from adistributor or main supply source (not shown). This air is controled bya valve 61 in the casing 5 1-, the valve being moved to open and closedposit-ion by suitable means timed to actuate the valve at thepropcrmoment, such means preferably including the upper and lower pivotedmembers 62 and 63 on the stationary cylinder 60, the members beingactuated by aseries of wipers Gel on a rotating drum 65, concentric withthe casing and turret 52. The air from the distributor is supplied tothe valve chamber 66 by means of a pipe 67 and passes downwardly fromsaid chamber through the tube 58 into the supply chamber 25 by way ofthe registering openings 68 and 69 located respectively in the arm 11and hollow shaft 51. The opening 69 is elongated in order that theopening G8 may register therewith when the arm is adjusted angular'lyupon the shaft 51.

Lengthening or shortening of the blow head arm to adjust it to the molddistance is effected by means of the split eccentric 70, interposedbetween the arm 11 and shaft. The eccentric is turned by turning thescrew 71, the thread of which engages the eccentric as a worm wheel.After adjustment, the arm ll'is clamped upon the eccentric and theeccentric upon the shaft 51 by means of the bolts 72, which extendthrough the split aws 73 of the arm, (Fig. 2).

The illustrated embodiment of the inven tion may be modified inconstruction, arrangement and operation, to adapt it to differentconditions, without departing from the scope of the invention asexpressed in the appended claims.

I claim:

1. In combination with a mold having a sealing surface, a blow headcooperating with said mold and comprising a vertically movable support,and a depending member mounted for free tilting movement relative tosaid support, the center of said tilting movement being disposedsubstantially in the plane of the sealing surface of said mold when saidblow head occupies an operative position with respect thereto.

2. In combination with a mold having a sealing surface, a two-partblowhead coopcrating with said mold and having a ball and socket jointconnecting said parts, the center of curvature of said joint beingdisposed substantially in the plane of the sealing surface of said moldwhen said blowhead occupies an operative position with respect thereto.

3. A blowhead comprising a support having a concave surface, and amember carried by said support and having a eoacting'convex surface forseating engagement with said concave surface, the center of curvature ofsaid coacting surfaces being disposed substantially in the plane of thelower surface of said member.

l. A blowhead comprising a support having a. conical seat, a memberhaving a coacting spherical portion adapted to pivotally' engage saidseat, and a sealing ring carried by said member for engagement with amold, the center of pivotal movement of said me1nher being disposedsubstantially in the plane of said sealing ring.

5. A blowhead comprising a support having a concaved seat, a memberhaving a coacting convexed portion adapted to pivotally engage saidseat, and a laterally movable sealing ring carried by said member forenill) gagement with a mold, the center of pivotal movement of saidmember being disposed substantially in the plane of the top surface ofsaid mold when said blowhead occupies an operative position with respectthereto.

6. In a glass blowing machine, the combination with a blow mold, oi ablow head, a fluid pressure device for moving said blow head into andout of operative position with respect to said mold, a single fluidpressure chamber having separate passages leading to the blow head tosupply blowing air thereto and to the fluid pressure device to actuatethe blow head, and means closing one of said passages and arranged toauton'iatieally open when the air in the chamber exceeds a predeterminedpressure.

7. In a glass blowing machine, the combination with a blow mold and apressure operatedblowhead, of a pressure chamber having separate supplypassages leading to the blowhead torsupplying air to move the head intoengagenient with the mold and to blow the blank therein, an automaticvalve for the passage controlling the supply of blowing air arranged toopen subsequently to the movement of the head, and means timed toperiodically supply compressed air to said chamber for each operation ofthe blowhead,

8. In a glass blowing machine, the combination-with a blow mold and apressure operated blowhead, of a pressure chamber,

I means for admitting separate supplies of air from said chamber to theblowhead at different pressures, one of said supplies being applied tooperatively position the blow head relative to the mold and the other ofsaid supplies being applied to provide blowing pressure, and means timedto intermittently supply compressed air to said chamber for eachoperation of the blowhead.

9. In a glass blowing machine, the combination with a blow mold and anair supply chamber, of a pressure actuated blowhead having separate airpassages leading to said chamber to admit air to the, blowhead forpositioning the blow head relative to the mold and provide blowingpressure, a valve for controlling each of said passages, the valve forthey blowing air passage being adapted to, transmit the blowing air at apressure below that serving to actuate the blowhead, and means formoving the blowhead toward and from the mold.

10.,In a glass blowing machine, the compination with a blow mold and anair supply chamber, of a pressure controlled blowhead, includingcylinder and a piston provided with a plurality 01" independently motable parts adapted to term a closure for the mold and to accommodatethemselves to relative angular and lateral displacement of the axes ofthe blowhead and the mold, and means for controlling the admittance ofseparate supplies of air from said chamber to the blowhcad at differentpressures l'or actuating the piston and blowing the blank in the mold.

11. In a glass blowing machine, the co1ubination with an air supplychamber and a blowhcad, including a. cylinder adapted for communicationwith the chan'iber, ol :1 piston in the cylinder provided with aplurality olf mold cooperating parts, each ol? which is freelyadjustable laterally oil? the piston, and means positioned exteriorlyoi? the cylinder for admitting air from the chamber to the blowhead ata. pressure dill'erent lrom that in the cylinder.

12. In a glass blowin machine, the colubination with a blow mold and anair supply chamber, a blowhead including a cylhide and a piston having a(ltfjhlltllllfl freely adjustable device for cooperation with the mold,means for controlling a supply oi air from said chamber to the cydinderfor actuating the piston, and independent means for automaticallyadmitting a separate supply of air from the chamber to said dependingdevice tor the blowing operation at a pressure different from that loractuating the piston.

13. In a blowhead, the combination with a cylinder and a piston, of a.depending device coi'inectce with the piston comprising a plurality ofrelatively movable lllttllllfitlri, each of which is free to be adjustedlaterally with respect to the piston and one oil which is adapted toform a cap for a mold, a sealing plate carried by one oil said members,means for admitting fluid under pressure to the cylinder above thepiston and through the sealing plate.

14. In a blowhead, the combination with a. cylinder and a piston, of adepelnling member mounted for tree tilting n'iovement relative to thepiston, a mold cap mounted for tree lateral movement upon said member,and a ware engaging sealing member supported by said depending miunber.

15. In a blowhead, the con'ibination with a cylinder and a. piston, of adepending menr ber mounted for free tilting moven'ient upon the piston,a mold cap mounted :lor tree lateral movement upon said depending memher, a ware eng ging sealing member, and

means for aejustably supporting said sealing member upon said dependingmember.

it). In a blowhead, the combination with a cylinder and a supporttherefor, of a piston within the cylinder provided with an annular seatand a plurality of lugs, and a dctachable mold coopec'ating devicecarried by said lugs, comprising a plurality oi? relatively movableparts, one of which mounted for tree adjustment upon said seat andanother for lateral adjustment with respect to said piston.

it. In a blowhead, the combination with cylinder and a support therefor,of a pisllll li ll ton provided with an annular seat and a plurality ofdepending lugs, and a device supported by said lugs for free tiltingmovement upon said seat and having a freely laterally adjustable portionadapted to form a cap for a mold.

18. In a blowhead, the combination with a cylinder and a piston, of adepending memher having a universal connection with the piston, asealing plate adjustably mounted upon said member, and a second membermounted for lateral movement-upon the first member and adapted toaccommodate itself to a mold when seating thereon.

19. In a blowhead, the combination with a cylinder and a piston, of adevice carried by the piston comprising two relatively movable membersone of which is free to adjust itself upon the piston according to theinclination of the axis of the mold and the other to accommodate itselfto the lateral position of a mold when seating thereon, a sealing platecarried by one of said members, and means for admitting a supply offluid to the cylinder to actuate the piston,

20. The combination with a mold, of a support, a blowhead carriedthereby for cooperation with the mold, an adjustable eccentric rotatableupon the support and adapted when actuated to shift the blowheadlat-erally relative to the axis of the mold.

21. The combination with a shaft and a blowhead support having a portionthrough which the shaft extends, of an adjustable eccentric interposedbetween the shaft and said support to shift it laterally of the shaft,and means for effecting the clamping of said support upon the eccentricto clamp the eccentric upon the shaft.

22. The combination with a shaft and a blowhead including an arm throughwhich the shaft extends, of an eccentric split-bushing interposedbetween the arm and shaft, a screw operatively associated with thebushing for turning it to effect lateral adjustment of the arm upon theshaft, and means for clamping the arm upon the bushing to clamp thelatter upon the shaft.

28. In combination with a mold having a sealing surface, a blow headcooperating with said mold and comprising a support having curvedrecess, a member depending from said support and having a portion shapedto movably engage said. recess, and another portion shaped for sealingengagement with said mold, the portion of said member adapted to engagesaid mold being disposed wholly within the sphere defined mounted forfloating movement in a direction transverse to the axis of said firstmentioned member to accommodate themselves to relative angular andlateral displacement of the blow head and the mold, and means forcontrolling the admittance of separate supplies of air from said chamberto said cylinder and said blow head at different pressures for actuatingthe piston and blowing the blank in the mold.

125. In a glass shaping machine including a mold, the combination of asupport having a curved recess therein, and a blow head having a portionshaped for movable engagement with said recess and a portion shaped forsealing engagement with said mold, the plane of the sealing surface ofsaid mold intersecting the sphere defined by a continuation of the curveof said recess when said blow head is in operable engagement therewith.

26. In a glass shaping machine including a blank mold and a cooperatingblow mold,

the combination of a blow head comprising a support having a curvedrecess therein, and a portion shaped for movable engagement with saidrecess, a portion shaped for sealing engagement with said blank mold anda portion shaped for sealing engagement with said blow mold, the planesof said sealing surfaces intersecting the sphere delined by acontinuation of the curve of said recess.

27. 11 a glass shaping machine including a mold, the combination of asupport having a curved recess therein, and a blowhcad having a portionshaped for movable engagement with said recess, and a portion shaped forsealing engagement with said mold, the latter portion of said blowheadbeing located between parallel planes dis posed normal to the axis ofsaid blowhead and tangent to the sphere defined by a continuation of thecurve of said recess.

Signed at Hartford, Conn, this 30th day of August, 1922.

ED WARD H. LORENZ.

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